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Butter the sides of a heavy 2-quart saucepan.
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In the saucepan combine brown sugar and buttermilk.
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Cook over medium-high heat to boiling, stirring constantly with a wooden spoon to dissolve sugar. Carefully clip candy thermometer to pan. Cook over medium-low heat, stirring occasionally, until thermometer registers 234 degree F, soft-ball stage.
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Remove saucepan from heat.
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Add the 2 tablespoons butter, but do not stir. Cool, without stirring, to 150 degree F.
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Remove candy thermometer from saucepan.
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Immediately stir in pecans.
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Beat vigorously with a wooden spoon until candy is just beginning to thicken, but is still glossy.
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Quickly drop the candy from a teaspoon onto a baking sheet lined with waxed paper.
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If the candy becomes too stiff to drop easily from the spoon, stir in a few drops of hot water.
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Store tightly covered.